I have emacs 25.2.2 and installed through M-x list-packages AUCTeX 12.1.1.

Opening any LaTeX file gives the native latex mode, so it seems through C-h m:

LaTeX/P mode defined in ‘tex-mode.el’:  
:override advice: ‘TeX-latex-mode’

Based on that, and the following, I would the say the activation did not go well:

You can detect the successful activation of AUCTeX and preview-latex in the menus after loading a LaTeX file like 'preview/circ.tex': AUCTeX then gives you a 'Command' menu, and preview-latex gives you a 'Preview' menu.

What should I do?

  • 2
    The override advice: ‘TeX-latex-mode’ indicates that AUCTeX is properly installed and activated and the LaTeX/P also indicates that you're using AUCTeX rather than the native latex-mode.
    – Stefan
    Nov 14, 2018 at 21:19
  • Same as said by Stefan, is also said here: stackoverflow.com/a/17778046/5986651
    – Pandian Le
    Feb 21, 2021 at 19:15

1 Answer 1


I suspect that you need to fire it up. Do something like:

(require 'tex-site)

in yr init.el (or .emacs).

  • 3
    When installed via package.el, this is not needed nor useful (it even used to cause problems).
    – Stefan
    Nov 14, 2018 at 21:20
  • Besides comment from @Stefan, loading AUCTeX with (require 'tex-site) was dropped with AUCTeX version 11.81 (released 2005). Nov 18, 2018 at 20:39

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